It’s not clear if even the white QB is a good character at all. One way it can go if we follow the Madoka logic is that the black and white QBs are staging fights between magical girls and enormeta so that they can harvest energy from those fights/emotions, together. At least it’s clear that the more powerful Baizer is the better for Vena. Let’s see how it goes, it can have tremendous potential and depth. Looking forward to how the author handles it.